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Goodwill and intangible assets - Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 62,523 | $ 52,363
Accumulated Amortization | (40,097) | (34,774)
Net Carrying Amount | 22,426 | 17,589
Core deposit intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 59,835 | 49,675
Accumulated Amortization | (38,807) | (33,861)
Net Carrying Amount | 21,028 | 15,814
Customer base trust intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,600 | 1,600
Accumulated Amortization | (547) | (387)
Net Carrying Amount | 1,053 | 1,213
Manufactured housing servicing intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,088 | 1,088
Accumulated Amortization | (743) | (526)
Net Carrying Amount | $ 345 | $ 562

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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